本文選題：光催化 + 降解效率��； 參考：《浙江海洋大學(xué)》2017年碩士論文

【摘要】：隨著經(jīng)濟(jì)的高速發(fā)展,環(huán)境污染、傳統(tǒng)能源短缺等問題日益嚴(yán)重,而太陽能是最直接有效的可再生能源。近年來,半導(dǎo)體催化降解有機(jī)污染物被認(rèn)為是有效地解決上述問題的最佳途徑。因此,制備簡單高效的半導(dǎo)體催化劑一直是廣大科研工作者的研究目標(biāo)。本文通過溶劑法成功制備了Bi_2O_2CO_3/MWCNTs復(fù)合光催化劑、貝殼粉/Bi OI復(fù)合光催化劑,并考察了制備的催化材料的光降解性能研究。本文的主要研究內(nèi)容分為以下四個方面:1)Bi_2O_2CO_3/MWCNTs復(fù)合光催化劑、貝殼粉/Bi OI復(fù)合光催化劑的制備;2)Bi_2O_2CO_3/MWCNTs復(fù)合光催化劑材料、貝殼粉/Bi OI復(fù)合光催化劑材料的表征;3)Bi_2O_2CO_3/MWCNTs復(fù)合光催化劑、貝殼粉/Bi OI復(fù)合光催化劑的性能考評;4)Bi_2O_2CO_3/MWCNTs復(fù)合光催化劑、貝殼粉/Bi OI復(fù)合光催化劑的穩(wěn)定性研究。主要研究結(jié)果如下:經(jīng)XRD、SEM、TEM、BET和UV-vis光譜等表征結(jié)果顯示,通過水熱法制備的Bi_2O_2CO_3/MWCNTs復(fù)合光催化劑具有三維花狀結(jié)構(gòu),且Bi_2O_2CO_3與MWCNTs緊密地生長到一起,形成了具有較大比表面積的異質(zhì)節(jié)。合成材料形成了Bi_2O_2CO_3/MWCNTs復(fù)合光催化劑。在模擬光源的情況下,降解50ml、6mg/L的羅丹明B有機(jī)污染溶液的得出純樣的Bi_2O_2CO、M/B-0.5%、M/B-1.5%、M/B-3%、M/B-5%、M/B-10%的催化效率依次為28.7%、60.9%、62.1%、80.8%、70.3%、69.2%。當(dāng)MWCNTs的百分比含量達(dá)到3%的時候,制備合成的Bi_2O_2CO_3/MWCNTs復(fù)合材料的降解效率最大,其降解能力為純樣Bi_2O_2CO_3降解能力的2.8倍。對M/B-3%樣品進(jìn)行循環(huán)降解實驗,結(jié)果表明即使在循環(huán)降解4次以后依然具有較高的光催化效率(76.7%)。說明制備的Bi_2O_2CO_3/MWCNTs復(fù)合光催化劑具有較好的光催化穩(wěn)定性。通過XRD表征顯示通過水熱法制備的貝殼粉/Bi OI復(fù)合光催化劑中,只有S/B-10%的復(fù)合催化劑出現(xiàn)了貝殼粉的特征衍射峰,說明制備的復(fù)合材料中有可能形成了貝殼粉/Bi OI異質(zhì)節(jié)催化劑。SEM結(jié)果進(jìn)一步表明,納米級別的貝殼粉和三維花狀結(jié)構(gòu)的Bi OI完美的相結(jié)合,而且形成的三維花狀的Bi OI超結(jié)構(gòu)并沒有被破壞掉,形成了異質(zhì)節(jié)。BET測定顯示隨著貝殼粉的加入,復(fù)合催化劑的比表面積隨著增加。UV-vis譜圖結(jié)果表明隨著貝殼粉質(zhì)量百分比的增加,貝殼粉/Bi OI復(fù)合材料的吸收波長發(fā)生紅移現(xiàn)象,表明材料對可見光的利用率增強(qiáng)。經(jīng)光催化降解60m L、6mg/L的羅丹明B染料溶液實驗表明,貝殼粉/Bi OI復(fù)合光催化劑具有較高的催化活性。當(dāng)貝殼粉含量為3%時,合成的復(fù)合材料的光催化降解能力最強(qiáng),為88.43%,是純樣Bi OI降解效率值的3.5倍。四次循環(huán)降解實驗后的效率為78.84%,表明制備的貝殼粉/Bi OI復(fù)合催化劑具有較好的催化穩(wěn)定性。
[Abstract]:With the rapid development of economy, environmental pollution and shortage of traditional energy are becoming more and more serious, and solar energy is the most direct and effective renewable energy. In recent years, semiconductor catalytic degradation of organic pollutants is considered to be the best way to solve these problems. Therefore, the preparation of simple and efficient semiconductor catalysts has been the research goal of many researchers. In this paper, the composite photocatalyst of Bistax _ 2CO _ 2CO _ 3 / MWCNTs and the composite photocatalyst of shell powder / BiOI were prepared by solvent method, and the photodegradation properties of the prepared materials were investigated. The main contents of this paper are as follows: 1) Bi2O2CO3 / MWCNTs composite photocatalyst, shell powder / BiOI composite photocatalyst preparation 2) Bi2O2CO3MWCNTs composite photocatalyst material, shell powder / BiOI composite photocatalyst material characterization 3) Bi2O2CO3MWCNTs composite photocatalyst, Evaluation of the performance of shell powder / BiOI composite photocatalyst 4) study on the stability of BiS _ 2O _ 2CO _ 2CO _ 2CO _ 3 / MWCNTs composite photocatalyst and shell powder / BiOI composite photocatalyst. The main results are as follows: XRDX SEMTEMN BET and UV-vis spectra show that Bi2O2CO3 / MWCNTs composite photocatalyst prepared by hydrothermal method has a three-dimensional flower-like structure, and Bi2O2CO3 and MWCNTs grow closely together to form heteronodes with larger specific surface area. The synthesized materials form BiS _ 2O _ 2CO _ 2CO _ 2C _ (3) / MWCNTs composite photocatalyst. In the case of a simulated light source, the degradation of 50 ml / 6 mg / L Rhodamine B organic pollution solution resulted in the pure Bi2O2COB-0.5 / MB-1.5 and the catalytic efficiency was 28.760.962.1% and 80.870.30.33% in the order of 28.760.962.1mg / L and 69.2wt%, respectively. When the percentage content of MWCNTs reaches 3%, the biodegradable efficiency of the synthesized composite is the highest, which is 2.8 times as high as that of the pure BiS _ 2O _ 2CO _ 3. The results showed that the photocatalytic efficiency (76. 7%) was higher even after 4 times of cyclic degradation of M / B-3% samples. The results show that the prepared Bi2O2CO3 / MWCNTs composite photocatalyst has good photocatalytic stability. XRD analysis showed that in the shell powder / BiOI composite photocatalyst prepared by hydrothermal method, only S- / B-10% composite catalyst appeared the characteristic diffraction peak of shell powder. The results show that the shell powder / BiOI heterojunction catalyst. SEM results further indicate that the nanoscale shell powder and the three dimensional flower-like structure of BiOI are perfectly combined. Moreover, the three dimensional flower-like BiOI superstructure was not destroyed, and the heterojunction was formed. BET measurement showed that with the addition of shell powder, The results of UV-vis spectra show that the absorption wavelength of shell powder / BiOI composites is red-shifted with the increase of the mass percentage of shell powder, which indicates that the utilization ratio of visible light is increased. The photocatalytic degradation of 6mg / L Rhodamine B dye solution by photocatalytic degradation showed that the composite photocatalyst of shell powder / BiOI had high catalytic activity. When the content of shell powder is 3, the photocatalytic degradation ability of the composite is the highest, which is 88.43, which is 3.5 times of the pure BiOI degradation efficiency. The efficiency of the four cycle degradation experiments is 78.84, which indicates that the prepared composite catalyst of shell powder / BiOI has good catalytic stability.
【學(xué)位授予單位】：浙江海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O643.36

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相關(guān)期刊論文 前1條

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本文編號：2057443